Fire-screen for explosive-engines



F. H. MERRILL DECD. e. E. MERRILL, ADMINISTRATRIX. FIRE SCREEN FOREXPLOSIVE ENGINES.

APPLICATION FILED SEPT. 8,1919. 1,363,801 Patented Dec. 28, 1920.

I N MN 701?.

UNITED STATES PATENT OFFICE.

FRANK H. MERRILL, DECEASED, LATE 0F HENNEPIN COUNTY, MINNESOTA, BY GRACEE. MERRILL, ADMINISTRATRIX, ASSIGNOR TO VEERAC COMPANY, OF MINNEAPOLIS,MINNESOTA, A CORPORATION OF MINNESOTA.

FIRE-SCREEN FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent.

Patented Dec. 28, 1920.

Original applicatin filed May 14, 1917, Serial No. 168,467. Divided andthis application filed September To all whom it may concern:

Be it known that FRANK H. lWInRRrLL, deceased, late citizen of theUnited States, and resident of the county of Hennepin and State ofMinnesota, had invented certain new and useful Improvements in Fire-Screens for Explosive-Engines; that GRACE E. IvTERRILL,WlClOW of thesaid FRANK H. MERRILL, has been duly appointed administratrix of theestate of said FRANK H. Mn nILL; and that the said GRACE E. MERRILL,administratrix, does hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention provides an improved fire screen especially designed forpreventing back firing through flame passages, and, generally stated,the invention consists of the novel construction and combination ofparts hereinafter described and defined in the claim. The presentapplication is filed as a division of the present applicants co-pendingapplication S. N. 168, 16? filed May 14, 1917, and entitled Fire screenfor explosive engines.

The invention is illustrated in the accompanying drawings wherein likecharacters indicate like parts throughout the several views. Referringto the drawings;

Figure 1 is a vertical section showing the fire screen applied in thetransfer passage of an internal combustion engine;

Fig. 2 is a plan view showing the screen moved from working position;and

Figs. 3 and 4 are face views showing, respectively, the disk-like heatconducting plates and spacing washers of the fire screen. Of the partsof the engine, in so far as they are pertinent, the numeral 5 indicatesthe cylinder, the numeral 6 the crank shaft compression chamber, and thenumeral 8 the transfer passage, the latter having a transverselyextended cylindrical screen seat 9.

The improved fire screen is made up of a Serial N0. 322,430.

multiplicity of laterally spaced thin metal disk-like heat conductingplates 10, spacing washers 11 of relatively small diameter and aclamping bolt 12 provided with a head 13 and a threaded end equippedwith a nut 14. The spacing washers 11 are interposed between thedisk-like plates 10 and the bolt 12 is passed through the axialperforations of the saidplates and washers and when the nut istightened, the said elements are rigidly clamped together. Theperimeters of the radiating plates 10 are circular and of such diameterthat they closely fit the cylindrical seat 9 so that a good contact ismade for the conduction of the heat from the screen to and through thewalls of the cylinder.

Fig. 1 illustrates one of the many uses to which this screen may be put.In this particular use it has been found highly eflicient for thepurposes had in view. The screen may be cheaply constructed and may betaken out and easily cleaned from time to time.

hat is claimed is:

A fire screen made up of a multiplicity of disk-like heat conductingplates, interposed spacing washers of relatively small diameter, and aclamping bolt extended axially through said plates and washers andclamping the same together, said plates, washers and clamping boltconstituting a self-contained unit, in combination with an elementhaving a seat for said unit and also having vapor inlet and outletpassageways opening into the seat at opposite edges of said plates andalong substantially the entire length of said unit.

In testimony whereof I affix my signature in the presence of twowitnesses.

GRACE E. MERRILL, Adwm'm'stratriw of F rank H. Merrill, deceased. oWitnesses:

CLARA DEMAREST, EVA E. KoNIe.

